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Diffstat (limited to 'vendor/rayon/src/iter/positions.rs')
-rw-r--r-- | vendor/rayon/src/iter/positions.rs | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/vendor/rayon/src/iter/positions.rs b/vendor/rayon/src/iter/positions.rs deleted file mode 100644 index f584bb2..0000000 --- a/vendor/rayon/src/iter/positions.rs +++ /dev/null @@ -1,137 +0,0 @@ -use super::plumbing::*; -use super::*; - -use std::fmt::{self, Debug}; - -/// `Positions` takes a predicate `predicate` and filters out elements that match, -/// yielding their indices. -/// -/// This struct is created by the [`positions()`] method on [`IndexedParallelIterator`] -/// -/// [`positions()`]: trait.IndexedParallelIterator.html#method.positions -/// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html -#[must_use = "iterator adaptors are lazy and do nothing unless consumed"] -#[derive(Clone)] -pub struct Positions<I: IndexedParallelIterator, P> { - base: I, - predicate: P, -} - -impl<I: IndexedParallelIterator + Debug, P> Debug for Positions<I, P> { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("Positions") - .field("base", &self.base) - .finish() - } -} - -impl<I, P> Positions<I, P> -where - I: IndexedParallelIterator, -{ - /// Create a new `Positions` iterator. - pub(super) fn new(base: I, predicate: P) -> Self { - Positions { base, predicate } - } -} - -impl<I, P> ParallelIterator for Positions<I, P> -where - I: IndexedParallelIterator, - P: Fn(I::Item) -> bool + Sync + Send, -{ - type Item = usize; - - fn drive_unindexed<C>(self, consumer: C) -> C::Result - where - C: UnindexedConsumer<Self::Item>, - { - let consumer1 = PositionsConsumer::new(consumer, &self.predicate, 0); - self.base.drive(consumer1) - } -} - -/// //////////////////////////////////////////////////////////////////////// -/// Consumer implementation - -struct PositionsConsumer<'p, C, P> { - base: C, - predicate: &'p P, - offset: usize, -} - -impl<'p, C, P> PositionsConsumer<'p, C, P> { - fn new(base: C, predicate: &'p P, offset: usize) -> Self { - PositionsConsumer { - base, - predicate, - offset, - } - } -} - -impl<'p, T, C, P> Consumer<T> for PositionsConsumer<'p, C, P> -where - C: Consumer<usize>, - P: Fn(T) -> bool + Sync, -{ - type Folder = PositionsFolder<'p, C::Folder, P>; - type Reducer = C::Reducer; - type Result = C::Result; - - fn split_at(self, index: usize) -> (Self, Self, C::Reducer) { - let (left, right, reducer) = self.base.split_at(index); - ( - PositionsConsumer::new(left, self.predicate, self.offset), - PositionsConsumer::new(right, self.predicate, self.offset + index), - reducer, - ) - } - - fn into_folder(self) -> Self::Folder { - PositionsFolder { - base: self.base.into_folder(), - predicate: self.predicate, - offset: self.offset, - } - } - - fn full(&self) -> bool { - self.base.full() - } -} - -struct PositionsFolder<'p, F, P> { - base: F, - predicate: &'p P, - offset: usize, -} - -impl<F, P, T> Folder<T> for PositionsFolder<'_, F, P> -where - F: Folder<usize>, - P: Fn(T) -> bool, -{ - type Result = F::Result; - - fn consume(mut self, item: T) -> Self { - let index = self.offset; - self.offset += 1; - if (self.predicate)(item) { - self.base = self.base.consume(index); - } - self - } - - // This cannot easily specialize `consume_iter` to be better than - // the default, because that requires checking `self.base.full()` - // during a call to `self.base.consume_iter()`. (#632) - - fn complete(self) -> Self::Result { - self.base.complete() - } - - fn full(&self) -> bool { - self.base.full() - } -} |